Not Ranked
Looks like 1 G3(or 8) to me. July 3rd(or 8th), 1971. The block should have some ribs on it on the side opposite the one with the screw in allen plugs that are shown in your pictures. If it does have ribs, it's a 68 Hydraulic lifter Service Block. If it doesn't , it's probably one of the last 66/67 Service Blocks made.
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